is one piece episode 361 filler?

Usopp sees how Perona can float and go straight through people, and learns that she is a ghost that left a physical body behind. With the real body of Perona revealed, Usopp fires a Big Bang Star, but the shot misses.

Perona says it was a dud, then reveals a large Special Hollow, scaring Usopp. She then fires more Hollows and tries to blow him up.

The Special Hollow then bites down on the sniper leaving him trapped in its teeth. Perona points out how the ghost's teeth is inescapable, then returns to her own body.